We nearly lost Udo when he flew into on the birdroom windows during the build. We are currently using a combination of decals, stained glass, Wingdows window perches, and tall plants...in every window that they may fly into in the house. So far so good, and all of our birds are flighted now (except for Udo). Also don't forget about screen door - there are magnet/pins that you can attach to screens too (helps humans too ).